<template>
  <el-container class="home-container">
      <!-- 头部区域 -->
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ? '64px' : '200px'"> 
                <div class="toggle-button" @click="toggleCollapse" >|||</div>
                   <el-menu 
                        router
                        :default-active="activePath"
                        :collapse="isCollapse"
                        :collapse-transition="false"
                        background-color="#333744"
                        text-color="#fff"
                        active-text-color="#409eee" unique-opened>
                        <!-- 一级菜单 -->
                        <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                            <!-- 一级菜单的模板区域 -->
                            <template slot="title">
                                <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                            </template>

                            <!-- 二级菜单 -->
                            <el-menu-item :index=" '/' + subItem.path + ''" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/' + subItem.path )">
                            <template slot="title">
                               <!-- 图标 -->
                            <i class="el-icon-menu"></i>
                            <!-- 文本 -->
                            <span>{{subItem.authName}}</span>
                            </template>
                            </el-menu-item>
                        </el-submenu>
                   </el-menu>
                   
            </el-aside>
            <!-- 右侧主体内容 -->
            <el-main>
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>

</template>

<script>
export default {
  data() {
   return {
    //    左侧菜单数据
       menulist: [],
       iconsObj : {
           '125': 'iconfont icon-user',
           '103': 'iconfont icon-tijikongjian',
           '101': 'iconfont icon-shangpin',
           '102': 'iconfont icon-danju',
           '145': 'iconfont icon-baobiao'
       },
    //    是否折叠
       isCollapse: false,
    //    被激活的链接地址
       activePath: '',
   }
  },

  created(){
      this.getMenuList(),
      this.activePath = window.sessionStorage.getItem('activePath')
  },

  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push("/login")
    },
    // 获取所有的菜单
    async getMenuList(){
        const{data: res} = await this.$http.get('menus')
        if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
        this.menulist = res.data
        console.log(res);    
    },
    // 点击按钮切换侧边栏的折叠与展开
    toggleCollapse(){
        this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath){
        window.sessionStorage.setItem('activePath',activePath)
        this.activePath = activePath
    }
  }
}
</script>

<style lang="less" scoped>
.el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
    }
}
.el-aside {
    background-color: #333744;
    .el-menu {
        border-right: none;
    }
}
.el-main {
    background-color: #eaedf1;
}
.home-container {
    height: 100%;
}
.iconfont {
    margin-right: 10px;
}
.toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;

}
</style>
